return nil, fmt.Errorf("unable to perform CPU IO profile with %d goroutines", n)
		}
		dirPath, err := os.MkdirTemp("", "profile")
		if err != nil {
			return nil, err
		}
		fn := filepath.Join(dirPath, "cpuio.out")
		f, err := Create(fn)
		if err != nil {
			return nil, err
		}
		stop := fgprof.Start(f, fgprof.FormatPprof)
		startedAt := time.Now()
		prof.stopFn = func() ([]byte, error) {